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Found problems: 2

1993 Austrian-Polish Competition, 5
Tags: system of equations , austrian polish , algebra
Solve in real numbers the system $$\begin{cases} x^3 + y = 3x + 4 \\ 2y^3 + z = 6y + 6 \\ 3z^3 + x = 9z + 8\end{cases}$$

1991 Austrian-Polish Competition, 1
Tags: equation , combination , austrian polish , algebra
Show that there are infinitely many integers $m \ge 2$ such that $m \choose 2$ $= 3$ $n \choose 4$ holds for some integer $n \ge 4$. Give the general form of all such $m$.